SkipStone is currently under heavy development, but it's progressing quickly and coming along nicely. It provides a nice configurable interface, bookmarks and all of the other mandantory browsing features.
Downloading is handled by SkipDownload by way of a default, a GTK+ front-end to the famous Web downloading utility, wget. However, if you prefer to use other download utilities and managers, this option is configurable.
Mail and external URL handlers are also handled by external applications that can be configured to the user's choice, leaving SkipStone to do what it does best -- browsing.
Tucows, Inc has graciously donated a copy of this software to the Internet Archive's Tucows Software Archive for long term preservation and access. Please check the Tucows website for all current versions of the software.